when a male and female are in a room having intercourse. the male is "hitting it from the back" (his back is facing a door and a window is on the wall next to them) while in mid pounding the male friend signals his partner in the room and they switch positions. the male who was originally "hitting it" goes outside and knocks on the window holding his thumbs up.
1."dude do you wanna perform the swap of faith tommorow"
2."Hey lauren said that you did the swap of faith on her last night! thats not cool."
3. "dude she was totally confused by the swap of faith last night"